LIVE · cybersecurity feed
Live wire
OpenAI Announced $1B in Defensive Tools for Water UtilitiesAttackers Breached JetBrains Cadence via Unpatched TeamCity, Extracting AWS CredentialsCVE-2026-59346 · Critical VMware Workstation and Fusion Flaw Lets VM Admins Execute Host CodeCVE-2026-32475 · Elementor Pro WordPress Plugin Vulnerability Exploited to Hack SitesBroadcom Patches Critical VMware Workstation and Fusion VM-Escape VulnerabilitiesHackers Leak Millions of Airport Passenger Records After Ransom RefusalUsing a VM to Contain an AI AgentCVE-2026-73749 · HPE Patches Critical RCE Vulnerabilities in AOS-CXCompanies Have Six Months to Prepare for Automated AttacksPhishing Campaign Sends Millions of Emails Using Invisible Unicode to Evade Filters
cve recordcritical

CVE-2026-27459

pyopenssl · pyopenssl

Published
CVSS9.8
Severitycritical
WeaknessCWE-120
ExploitedNot in CISA KEV

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.

References

← Back to the CVE Tracker

Our coverage of CVE-2026-27459

No stories yet. This page updates automatically when we publish reporting that references CVE-2026-27459.